Gonzalo Irisarri

Gonzalo Irisarri
Rothamsted Research · Sustainable Agriculture Sciences – North Wyke

Dr

About

39
Publications
7,450
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497
Citations
Citations since 2017
17 Research Items
395 Citations
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Introduction
I focus my research interest on rangeland ecology and grazing. To do so, I use remote sensing to understand the spatial and temporal variations of ANPP. I contributed to a national scale forage production observatory (http://produccionforrajes.org.ar/) in Argentina, and developed a crude protein APP for grasslands (https://irisarri.users.earthengine.app/view/contenido-proteina-cruda.)
Additional affiliations
October 2015 - present
IFEVA
Position
  • Researcher

Publications

Publications (39)
Article
Full-text available
Abstract. The Río de la Plata Grasslands (RPG) are one of the largest areas of open ecosystems (grasslands, shrublands and savannas) in the world. Historically, these systems have experienced, and continue to experience, an enormous loss of natural habitats. Moreover, their importance has been largely invisible in comparison to forested systems. Th...
Article
CONTEXT Mechanistic sorghum models have been mostly used to estimate sorghum yield for grain sorghum for a range of genotype, management, and environmental conditions. There is a lack of model testing for crop growth and development responses for forage genotypes and information for phenological parameterization under sub-optimal water and nitrogen...
Article
Full-text available
Due to ongoing global warming, seasonal patterns of aboveground net primary production (ANPP) may be altered by temperature trends. Of particular interest is the seasonal association between ANPP and temperature at the beginning of the growing season (the period encompassing minimum to maximum ANPP), where two contrasting mechanisms are in tension....
Article
On the Ground •The combination of stocking rate and marketing date that maximizes average net return per head will not necessarily maximize average net return per hectare. •The combination of stocking rate and marketing date that maximizes average net return per hectare often comes with risk-related tradeoffs, such as a higher risk and magnitude o...
Article
Full-text available
In the Great Plains of central North America, sustainable livestock production is dependent on matching the timing of forage availability and quality with animal intake demands. Advances in remote sensing technology provide accurate information for forage quantity. However, similar efforts for forage quality are lacking. Crude protein (CP) content...
Article
The temporal trend of aboveground net primary production (ANPP) is frequently used to estimate the human effect on ecosystems. In water‐limited ecosystems, like most grazing areas in the world, human effects act upon ANPP in combination with environmental variations. Our main objective was to quantify long‐term (1981‐2012) changes of ANPP and discr...
Article
Rangeland stocking rate is subjected to opposite forces. On the one hand, it is expected to fluctuate with interannual variations of aboveground net primary production (ANPP). On the other hand, it is expected to be stabilized by human interventions aimed at keeping a constant monetary flow. The global drought experienced during the first decade of...
Article
Sustainability of ranches and rural economies in the Great Plains of western North America is contingent on the economic vitality of beef production in a changing climate. Our objective was to measure and compare the interannual variability of beef production (kg/ha) and net returns ($/ha) over the past 15 years (2003-2017) from grazing yearlings a...
Article
Full-text available
Monitoring of aboveground net primary production (ANPP) is critical for effective management of rangeland ecosystems but is problematic due to the vast extent of rangelands globally, and the high costs of ground-based measurements. Remote sensing of absorbed photosynthetically active radiation (APAR) can be used to predict ANPP, potentially offerin...
Article
Full-text available
In livestock systems of the Argentinean Pampas, its forage production stability relies on the integration of two landcovers, annual forage crop sequences and perennial pastures. Despite the key role that these forage cropping systems have on current milk and beef production, it is unclear how year-by-year variability of precipitation affect forage...
Article
New integrated perspectives are increasingly needed to bridge the gap between biophysical and ecosystem services' based assessments of desertification. For a vast area of the dry Chaco region we sought to: (1) assess the spatial extent of four syndromes of vegetation change, associated with human or climatic drivers and (2) estimate and compare the...
Article
Full-text available
Fetzel et al. (2017) globally mapped the gap between observed and potential grazing intensity (GI): the ratio between consumption by livestock and aboveground net primary productivity (ANPP). Fetzel et al. (2017) estimated grazing land, forage production and livestock demand at a half-degree resolution. This article is protected by copyright. All r...
Article
Full-text available
Variation in aboveground net primary production (ANPP) is usually studied across wide environmental gradients focusing on spatial averages of zonal natural communities. We studied the spatial and temporal variation of ANPP of upland sown pastures and lowland natural grasslands across a narrow gradient of precipitation and temperature. The Flooding...
Article
Full-text available
p>Una elevada proporción del territorio argentino corresponde a tierras secas y una tercera parte de éstas se hallan en la Patagonia. Esta región históricamente ha sufrido procesos de deterioro del pastizal. Generalmente, la degradación es atribuida al uso ganadero; sin embargo, el efecto del clima sobre estos sistemas ha sido poco analizado. El ob...
Article
Most of Argentina territory is classified as dry lands, one third of them is located in Patagonia. The grasslands in this region have been historically affected by deterioration. This degradation has been associated to excessive grazing. However, little attention has been paid to the effect of climate on these systems. The aim of this work was to e...
Article
Full-text available
Polyploidy and symbiotic Epichloë fungal endophytes are common and heritable characteristics that can facilitate environmental range expansion in grasses. Here we examined geographic patterns of polyploidy and the frequency of fungal endophyte colonized plants in 29 Festuca rubra L. populations from eight geographic sites across latitudes from Spai...
Data
Endophyte status and cytometric data of the plants with the geographic information, grazing level and mean normalized difference vegetation index (mean NDVI) of the collection sites. (XLS)
Article
On the Ground A common practice for assessing livestock weight gains from grazing animals on rangelands is to confine animals overnight without feed or water to reduce variation in weight loss and percent shrink.Advances in remote sensing of vegetation, such as the Normalized Difference Vegetation Index (NDVI) provide opportunities to estimate gree...
Article
Grazing intensity elicits changes in the composition of plant functional groups in both shortgrass steppe (SGS) and northern mixed-grass prairie (NMP) in North America. How these grazing intensity-induced changes control aboveground net primary production (ANPP) responses to precipitation remains a central open question, especially in light of pred...
Article
Full-text available
Grazing intensity elicits changes in the composition of plant functional groups in both shortgrass steppe (SGS) and northern mixed-grass prairie (NMP) in North America. How these grazing intensity-induced changes control aboveground net primary production (ANPP) responses to precipitation remains a central open question, especially in light of pred...
Article
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an...
Article
Full-text available
Agricultural systems are expected to have higher net secondary production (NSP) than natural systems as a result of higher trophic efficiency and lower interannual variability. These differences, however, have not been quantified across regional gradients. We compiled a dataset of herbivore biomass, consumption, NSP, annual precipitation, and above...
Chapter
Full-text available
The objectives of this chapter are (1) to introduce two approaches for ANPP estimations—the classic way through biomass harvests and a more recent practice based on remote sensing data, and (2) to describe a forage production monitoring system that routinely observes ranches of Argentina and Uruguay based on the second approach. In this chapter, we...
Article
Full-text available
En sistemas de pastoreo extensivo, la productividad primaria neta aérea, PPNA, representa el principal determinante de la capacidad de carga. A escala de paisaje, existe un limitado conocimiento sobre la variación espacial y temporal de la PPNA. A partir de información novedosa provista por satélites se caracterizó la dinámica mensual de la PPNA pa...
Article
(1) Can above-ground net primary production (ANPP) of Patagonian meadows be estimated from remote sensing? (2) How does ANPP of Patagonian meadows change in space and time? Northwestern Patagonia, meadows embedded in a steppe matrix (39–43°S, 70–72ºW; area: 85 000 km2). For the first question, we contrasted field ANPP measurements with MODIS high-s...
Technical Report
Full-text available
Resumen En 2011 un amplio sector de la Patagonia fue afectado por dos eventos extraordinarios: la erupción del Volcán Puyehue, con su consecuente deposición de cenizas, y una sequía determinada por precipitaciones 30-50% por debajo de la media. El objetivo general de este informe es brindar un panorama cuantitativo del estado de la producción de ma...
Article
Full-text available
Diversity often increases ecosystem functioning and enhances stability, but this relationship has been evaluated at the community scale and considering, for the most part, only species richness. Here, we explored the relationship between landscape diversity and either the coefficient of variation or the interannual standard deviation of greenness i...
Article
Full-text available
This study attempts (1) to evaluate the capability of hyperspectral reflectance to differentiate C3 and C4 grass species, both in isolation and in mixed canopies; (2) to identify the critical spectral ranges that differentiate the two groups and individual species within them; and (3) to determine if there is temporal variation in these capabilitie...
Article
Full-text available
Introducción Existe hoy en día interés por parte de técnicos y productores en conocer la necesidad de aplicación de nitrógeno en cobertura para mejorar el rendimiento y la calidad proteica de los granos. Tradicionalmente, quienes tienen que tomar decisiones de este tipo, deben realizar mediciones a campo con equipos portátiles que estiman el conten...

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Projects

Projects (4)
Project
National estimations of forage production for grazing production systems planning. Estimations are based on remote sensing information. We take advantage of MODIS mission satellite data to estimate forage production on a monthly base from 2000 to the present. http://produccionforrajes.org.ar/
Project
We will assess how crop-livestock practices impact farm performance regionally under different climate change scenarios. Coupling existing multiple-scaling and remote-sensing techniques with advanced biophysical models we will evaluate drivers of yield variability for feed systems in Argentina, Uruguay and Australia.
Project
Proyecto de tesis doctoral: El objetivo principal de este proyecto es comprender los efectos (directos e indirectos) del uso silvopastoril sobre la demografía de Ciprés de la cordillera (A. chilensis) y Coihue (N. dombeyi) en bosques mixtos de Patagonia norte. Se pretende generar información sobre la dinámica de regeneración natural de estas especies bajo diferentes intensidades de uso silvopastoril (dadas por el manejo a nivel predial), identificar las principales modificaciones y analizar su implicancia futura sobre le crecimiento poblacional. A su vez, se busca abordar la respuesta del sistema a la exclusión de la actividad y su capacidad de recuperación en el corto plazo.